Re****tpro and copies

Hello

We are currently managing to do multiple p***** through a do***ent to get 
from different trays so that one invoice for example can have two copies
but 
would always be all pages of one invoice then all pages again

so we would get

I1 P1 C1
I1 P2 C1
I1 P3 C1
I1 P1 C2
I1 P2 C2
I1 P3 C2
I2 P1 C1
I2 P2 C1
I2 P1 C2
I2 P2 C2

Or we can tell the printer to do multiple pages and get

I1 P1 C1
I1 P1 C2
I1 P2 C1
I1 P2 C2
I1 P3 C1
I1 P3 C2

But I would like to be able to do the oRe****t:Printdevice:Copies := 2 with

two different trays.

Any ideas if this is possible?

Thanks